@Kenny.Vo
i got it now
seems your problem is not with battetypatch it self
it's with smartreflex some N900 cannot play videos smoothly while having vdd1 enabled

and please remove the attachment now lol i see some download rate

you can install the latest batteypatch and edit /usr/share/kernel-power-settings/overclock
and change vdd1 to 0

and the reboot loop happened because that old version (2.1) is not fully compatible with KPv49 (it has some problems with prerm script)